These are the facts to rebut just a few of the fallacies I read on a daily basis about our party. The Truth About Yisrael Beytenu Hamad Amar November 8, 2012. Masood Aziz outlines six fallacies they perpetuate about the US engagement in Afghanistan.
The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity.Since its invention, the disk has also been used in a modified, smaller 20 cm (8 in) diameter, black and white design to measure freshwater transparency. Secchi disk measurement should always be taken off the shady side of a boat or dock between 9 am and 3 pm The period for best results is between 10 am and 2 pm. The same observer should take Secchi depth measurements in the same manner every time.
The timing and duration of spring turnover depends on the size and depth of the lake. As the weather becomes warmer in late May, the surface water warms again and begins to float on top of the cold deeper water. Once the lake begins to form into layers, summer stratification (layering) has begun. You can track spring turnover in an individual lake with a Secchi disk. A Secchi disk measures water clarity. During spring turnover, the clarity of a lake usually decreases because mixing brings up nutrient rich water from the bottom of the lake and causes the lake to look cloudy.